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hydroxytyrosol

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https://www.readbyqxmd.com/read/28097900/structure-activity-relationships-of-fraxamoside-as-an-unusual-xanthine-oxidase-inhibitor
#1
Rosa Maria Vitale, Lina Antenucci, Margherita Gavagnin, Gennaro Raimo, Pietro Amodeo
Fraxamoside, a macrocyclic secoiridoid glucoside featuring a hydroxytyrosol group, was recently identified as a xanthine oxidase inhibitor (XOI) comparable in potency in vitro to the standard antigout drug allopurinol. However, this activity and its considerably higher value than its derivatives oleuropein, oleoside 11-methyl ester, and hydroxytyrosol are not explained by structure-activity relationships (SARs) of known XOIs. To exclude allosteric mechanisms, we first determined the inhibition kinetic of fraxamoside...
December 2017: Journal of Enzyme Inhibition and Medicinal Chemistry
https://www.readbyqxmd.com/read/28071793/antioxidant-effect-of-natural-table-olives-phenolic-extract-against-oxidative-stress-and-membrane-damage-in-enterocyte-like-cells
#2
Gabriele Serreli, Alessandra Incani, Angela Atzeri, Alberto Angioni, Marco Campus, Emanuele Cauli, Roberto Zurru, Monica Deiana
The phenolic fraction of a naturally fermented cultivar of table olives, "Tonda di Cagliari," was investigated for the ability to protect Caco-2 cells against oxidative stress and membrane damage induced by tert-butyl hydroperoxyde (TBH). TBH exposure resulted in an alteration of cellular redox status, with an increase in reactive oxygen species (ROS) and a decrease in reduced glutathione (GSH) level. A loss of the epithelial integrity, as indicated by the decrease of the transepithelial electrical resistance value, was also observed over time, together with an intense lipid peroxidation process...
January 10, 2017: Journal of Food Science
https://www.readbyqxmd.com/read/28071050/hydroxytyrosol-and-the-colonic-metabolites-derived-from-virgin-olive-oil-intake-induce-cell-cycle-arrest-and-apoptosis-in-colon-cancer-cells
#3
Maria-Carmen López de Las Hazas, Carme Piñol, Alba Macià, Maria-José Motilva
After the sustained consumption of virgin olive oil (VOO), the unabsorbed native phenols (mainly hydroxytyrosol (HT)) are transformed into its catabolites in the intestine by microbials. The role of these catabolites in preventing colon cancer has not been sufficiently investigated. This work aims to study the antiproliferative and apoptotic activities in colon (Caco-2; HT-29) cancer cell lines of the main catabolites detected in human feces (phenylacetic, phenylpropionic, hydroxyphenylpropionic, and dihydroxyphenylpropionic acids and catechol), after the sustained VOO intake...
January 19, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28063380/hydroxytyrosol-supplementation-increases-vitamin-c-levels-in-vivo-a-human-volunteer-trial
#4
Eduardo Lopez-Huertas, Juristo Fonolla
Hydroxytyrosol (HT) is a main phenolic component of olive oil. In this study, we investigated the safety and effects produced by HT purified (99.5%) from olive mill waste. HT was administered at a daily dosage of 45mg for 8 weeks to volunteers with mild hyperlipidemia (n=14). We measured markers of cardiovascular disease risk, enzyme markers of several clinical conditions, hematology, antioxidant parameters, vitamins and minerals at baseline (T0), 4 weeks (T4) and 8 weeks (T8). The values obtained at T4 and T8 were compared with baseline...
December 26, 2016: Redox Biology
https://www.readbyqxmd.com/read/28024731/olive-oil-polyphenols-a-quantitative-method-by-high-performance-liquid-chromatography-diode-array-detection-for-their-determination-and-the-assessment-of-the-related-health-claim
#5
Massimo Ricciutelli, Shara Marconi, Maria Chiara Boarelli, Giovanni Caprioli, Gianni Sagratini, Roberto Ballini, Dennis Fiorini
In order to assess if an extra virgin olive oil (EVOO) can be acknowledged with the health claim related to olive oil polyphenols (Reg. EU n.432/2012), a new method to quantify these species in EVOO, by means of liquid-liquid extraction followed by HPLC-DAD/MS/MS of the hydroalcoholic extract, has been developed and validated. Different extraction procedures, different types of reverse-phase analytical columns (Synergi Polar, Spherisorb ODS2 and Kinetex) and eluents have been tested. The chromatographic column Synergi Polar (250×4...
December 11, 2016: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28012379/the-lc-ms-based-metabolomics-of-hydroxytyrosol-administration-in-rats-reveals-amelioration-of-the-metabolic-syndrome
#6
Nikolaos Lemonakis, Hemant Poudyal, Maria Halabalaki, Lindsay Brown, Anthony Tsarbopoulos, Alexios-Leandros Skaltsounis, Evagelos Gikas
Hydroxytyrosol (HT), an important component of olive fruit and olive oil, improves the signs of metabolic syndrome in rats following chronic treatment. At a dose of 20mg/kg/day, HT decreased adiposity and improved cardiovascular and liver structure and function in rats fed with a high-carbohydrate, high-fat diet. An untargeted metabolomics approach has been employed using both UPLC-Orbitrap and -QqTOF methods to identify the changes induced by chronic HT administration on the plasma metabolome. 31 metabolites have been found to be differentially expressed between the examined groups...
January 15, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/27999296/the-health-benefiting-mechanisms-of-virgin-olive-oil-phenolic-compounds
#7
REVIEW
Lisa Parkinson, Sara Cicerale
Virgin olive oil (VOO) is credited as being one of the many healthful components associated with the Mediterranean diet. Mediterranean populations experience reduced incidence of chronic inflammatory disease states and VOO is readily consumed as part of an everyday Mediterranean dietary pattern. VOO is rich in phenolic compounds and the health promoting benefits of these phenolics are now established. Recent studies have highlighted the biological properties of VOO phenolic compounds elucidating their anti-inflammatory activities...
December 16, 2016: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/27998828/nutritionally-relevant-concentrations-of-resveratrol-and-hydroxytyrosol-mitigate-oxidative-burst-of-human-granulocytes-and-monocytes-and-the-production-of-pro-inflammatory-mediators-in-lps-stimulated-raw-264-7-macrophages
#8
Elisabetta Bigagli, Lorenzo Cinci, Sara Paccosi, Astrid Parenti, Mario D'Ambrosio, Cristina Luceri
The health benefits of bio-active phenolic compounds have been largely investigated in vitro at concentrations which exceed those reachable in vivo. We investigated and compared the anti-inflammatory effects of resveratrol, hydroxytyrosol and oleuropein at physiologically relevant concentrations by using in vitro models of inflammation. Human granulocytes and monocytes were stimulated with phorbol myristate acetate (PMA) and the ability of resveratrol, hydroxytyrosol and oleuropein to inhibit the oxidative burst and CD11b expression was measured...
February 2017: International Immunopharmacology
https://www.readbyqxmd.com/read/27986474/phosphatidyl-hydroxytyrosol-and-phosphatidyl-tyrosol-bilayer-properties
#9
Kervin O Evans, David L Compton
Hydroxytyrosol and tyrosol phospholipids were enzymatically synthesized and investigated for their bilayer properties. Dynamic light scattering demonstrated that hand extrusion at 100nm consistently resulted in liposomes of nearly 85nm diameter for both phosphatidyl-hydroxytyrosol (DOPHT) and phosphatidyl-tyrosol (DOPT). Transmission electron microscopy showed DOPT and DOPHT liposomes extruded at 100-nm to be spherical and non-distinctive from one another. Zeta potential measurements resulted in surface charges<-25mV, demonstrating both DOPT and DOPHT form highly stable liposomes...
December 14, 2016: Chemistry and Physics of Lipids
https://www.readbyqxmd.com/read/27979155/hydroxytyrosol-targets-extracellular-matrix-remodeling-by-endothelial-cells-and-inhibits-both-ex-vivo-and-in-vivo-angiogenesis
#10
Javier A García-Vilas, Ana R Quesada, Miguel Ángel Medina
The health benefits of olive oil are attributed to their bioactive compounds, such as hydroxytyrosol. Previously, we demonstrated that hydroxytyrosol inhibits angiogenesis in vitro. The present study aimed to: i) get further insight into the effects of hydroxytyrosol on extracellular matrix remodeling; and ii) test whether hydroxytyrosol is able to inhibit angiogenesis ex vivo and in vivo. Hydroxytyrosol induced a shift toward inhibition of proteolysis in endothelial cells, with decreased expression of extracellular matrix remodeling-enzyme coding genes and increased levels of some of their inhibitors...
April 15, 2017: Food Chemistry
https://www.readbyqxmd.com/read/27965098/protective-effects-of-hydroxytyrosol-on-gentamicin-induced-nephrotoxicity-in-mice
#11
Nooshin Ahmadian Chashmi, Sarvenaz Emadi, Hossein Khastar
BACKGROUND: Gentamicin (GM) is an effective and common antibiotic against severe gram-negative infections. However, its nephrotoxic action has limited the extent of its use. The aim of this study was to investigate the protective effects of hydroxytyrosol (HT) on gentamicin induced nephrotoxicity in mice. METHODS: Male mice (n = 27) were randomly assigned to three groups: (1) Sham, (2) GM (100 mg/kg for 7 days) (3) GM + HT (2 mg/kg BW; gastric gavages, for 7 days)...
January 22, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/27964734/therapeutic-properties-in-tunisian-hot-springs-first-evidence-of-phenolic-compounds-in-the-cyanobacterium-leptolyngbya-sp-biomass-capsular-polysaccharides-and-releasing-polysaccharides
#12
Lamia Trabelsi, Amira Mnari, Mohamed M Abdel-Daim, Salwa Abid-Essafi, Lotfi Aleya
BACKGROUND: In Tunisia, the use of hot spring waters for both health and recreation is a tradition dating back to Roman times. In fact, thermal baths, usually called "Hammam" are recommended as a therapeutic and prophylactic measure against many types of illness and toxicity. While the chemical concentration of thermal water is admittedly associated with its therapeutic effects, the inclusion in spa waters of efficient bioproduct additives produced by photosynthetic microorganisms and that act against oxidative stress may comprise a significant supplementary value for thermal centers...
December 13, 2016: BMC Complementary and Alternative Medicine
https://www.readbyqxmd.com/read/27940206/hydroxytyrosol-ameliorates-metabolic-cardiovascular-and-liver-changes-in-a-rat-model-of-diet-induced-metabolic-syndrome-pharmacological-and-metabolism-based-investigation
#13
Hemant Poudyal, Nikolaos Lemonakis, Panagiotis Efentakis, Evangelos Gikas, Maria Halabalaki, Ioanna Andreadou, Leandros Skaltsounis, Lindsay Brown
Metabolic syndrome is a clustering of interrelated risk factors for cardiovascular disease and diabetes. The Mediterranean diet has been proposed as an important dietary pattern to confer cardioprotection by attenuating risk factors of metabolic syndrome. Hydroxytyrosol (HT) is present in olive fruit and oil, which are basic constituents of the Mediterranean diet. In this study, we have shown that treatment with HT (20mg/kg/d for 8 weeks) decreased adiposity, improved impaired glucose and insulin tolerance, improved endothelial function with lower systolic blood pressure, decreased left ventricular fibrosis and resultant diastolic stiffness and reduced markers of liver damage in a diet-induced rat model of metabolic syndrome...
December 8, 2016: Pharmacological Research: the Official Journal of the Italian Pharmacological Society
https://www.readbyqxmd.com/read/27931126/%C3%AE-tocopherol-%C3%AE-carotene-lutein-squalene-and-secoiridoids-in-seven-monocultivar-italian-extra-virgin-olive-oils
#14
Roberto Ambra, Fausta Natella, Sabrina Lucchetti, Valentina Forte, Gianni Pastore
Fatty acids and bioactive lipophilic and hydrophilic compounds (tocopherols, β-carotene, lutein, squalene, total polyphenols and secoiridoids) in monocultivar Italian extra-virgin olive oil (EVOO) samples produced from the Leccino cultivar and six other yet uncharacterised cultivars (Rustica, Carpinetana, Dritta, Gentile di Chieti and Intosso) were analysed, also taking into account the effect of the type of decanter used for the oil extraction. Significant differences among cultivars were found for α-tocopherol and squalene, but not for carotenoids...
December 8, 2016: International Journal of Food Sciences and Nutrition
https://www.readbyqxmd.com/read/27929185/melatonin-and-hydroxytyrosol-protect-against-oxidative-stress-related-to-the-central-nervous-system-after-the-ingestion-of-three-types-of-wine-by-healthy-volunteers
#15
Javier Marhuenda, Sonia Medina, Pedro Martínez-Hernández, Simón Arina, Pilar Zafrilla, Juana Mulero, Camille Oger, Jean-Marie Galano, Thierry Durand, Federico Ferreres, Angel Gil-Izquierdo
Adrenic acid (AdA) and docosahexaenoic acid (DHA) peroxidation produces F2-dihomo-IsoPs and neuroprostanes, which have been related to oxidative damage in the central nervous system. Besides polyphenols, melatonin (MEL) and hydroxytyrosol (OHTyr) could be partly responsible for the antioxidant benefits of red wine (excluding colon derivatives). In order to elucidate whether these compounds are responsible for the protective antioxidant effects of red wine, a double-blind, crossover, placebo-controlled in vivo study - involving the intake of red wines and their native musts by healthy volunteers - was performed...
December 8, 2016: Food & Function
https://www.readbyqxmd.com/read/27916128/a-paper-based-platform-with-a-pencil-drawn-dual-amperometric-detector-for-the-rapid-quantification-of-ortho-diphenols-in-extravirgin-olive-oil
#16
Nicolò Dossi, Rosanna Toniolo, Flavia Impellizzieri, Franco Tubaro, Gino Bontempelli, Fabio Terzi, Evandro Piccin
A simple, sensitive and fast responding device is described for the discrimination of hydrophilic ortho-diphenols, whose presence in abundant enough amounts is typical for extra virgin olive oils (EVOOs), from hydrophilic mono-phenols instead present in almost all vegetable oils. It consists of a dual electrode detector pencil-drawn at the end of a paper microfluidic channel, defined by hydrophobic barriers, where samples of these antioxidants, extracted from vegetable oils by a 80:20% v/v acetonitrile/water mixture, were applied...
January 15, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/27914878/hydroxytyrosol-modulates-the-levels-of-microrna-9-and-its-target-sirtuin-1-thereby-counteracting-oxidative-stress-induced-chondrocyte-death
#17
S D'Adamo, S Cetrullo, S Guidotti, R M Borzì, F Flamigni
OBJECTIVE: Nutraceutical compounds, such as hydroxytyrosol (HT), have been found to exert protective effects in osteoarthritis (OA) by affecting a variety of key molecular and cellular processes in chondrocytes. However, to our knowledge, no relationship has been reported between nutraceuticals and microRNA (miR) network in OA models. Here, we identified a miR that is implicated in HT-mediated chondroprotection following oxidative stress condition by targeting sirtuin-1 (SIRT-1). METHODS: Human primary and C-28/I2 chondrocytes were pre-treated with 100 μM HT 30 min before 100 μM H2O2 addition...
December 1, 2016: Osteoarthritis and Cartilage
https://www.readbyqxmd.com/read/27913892/early-harvest-effects-on-hydrophilic-phenolic-components-of-extra-virgin-olive-oils-cvs-ayval%C3%A4-k-memecik-and-topaka%C3%A5-%C3%A4
#18
Fatma Yıldırım, Adnan Nurhan Yıldırım, Gülcan Özkan, Bekir Şan, Mehmet Polat, Hatice Aşık, Yaşar Karakurt, Sezai Ercişli
The study was conducted to determine the effects of cultivar, harvest period, and their interaction on the hydrophilic phenolic components extra virgin olive oils of the cultivars 'Ayvalık,' 'Memecik,' and 'Topakaşı.' Olives were collected at three different harvesting periods: (1) early harvest period-1 (Beginning of spotting), (2) early harvest period-2 (End of spotting), and (3) optimum harvest period. Oils were extracted using the Abencor system. HPLC (High-performance liquid chromatograph) technique was used to quantify the phenolic compounds including tyrosol (p-HPEA), hydroxytyrosol (3,4-DHPEA), luteolin, rutin, quercetin, catechin, sinapinic acid, p-coumaric acid, cinnamic acid, vanillin, vanillic acid, ferulic acid, and gallic acid...
December 2, 2016: Biochemical Genetics
https://www.readbyqxmd.com/read/27908553/olive-polyphenol-effects-in-a-mouse-model-of-chronic-ethanol-addiction
#19
Valentina Carito, Mauro Ceccanti, Vincenzo Cestari, Fausta Natella, Cristiano Bello, Roberto Coccurello, Rosanna Mancinelli, Marco Fiore
OBJECTIVES: Alcohol addiction elicits oxidative imbalance and it is well known that polyphenols possess antioxidant properties. We investigated whether or not polyphenols could confer a protective potential against alcohol-induced oxidative stress. METHODS: We administered (per os) for two months 20 mg/kg of olive polyphenols containing mostly hydroxytyrosol in alcoholic adult male mice. Hydroxytyrosol metabolites as hydroxytyrosol sulfate 1 and hydroxytyrosol sulfate 2 were found in the serum of mice administered with polyphenols with the highest amount in animals treated with both polyphenols and alcohol...
January 2017: Nutrition
https://www.readbyqxmd.com/read/27907867/adsorption-characteristics-of-adsorbent-resins-and-antioxidant-capacity-for-enrichment-of-phenolics-from-two-phase-olive-waste
#20
Zhihong Wang, Chengzhang Wang, Jiaojiao Yuan, Changwei Zhang
In this study, the adsorption properties of nine resins including polyamide resin (30-60), polyamide resin (60-100) AB-8, S-8, D-101, NKA-9, NKA-II, XDA-1 and XDA-4 for enrichment phenolics of the olive waste were investigated. XDA-1 and NKA-II were chosen for further study due to their outstanding adsorption and desorption capacity. XDA-1 and NKA-II had similar adsorption and desorption behaviors for phenolics of olive waste. The adsorption mechanism could be better explained by pseudo second-order kinetics model and Freundlich isotherm model, and the adsorption processes were spontaneously and exothermic...
January 1, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
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